CdCl2 treatment related diffusion phenomena in Cd1xZnxS/CdTe solar cells
Kartopu, Giray, Taylor, A.A., Clayton, Andrew J, Barrioz, Vincent, Lamb, D.A. and Irvine, Stuart J (2014) CdCl2 treatment related diffusion phenomena in Cd1xZnxS/CdTe solar cells. Journal of Applied Physics, 115. pp. 1-5. ISSN 0021-8979
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Abstract
Utilisation of wide bandgap Cd1_xZnxS alloys as an alternative to the CdS window layer is an attractive route to enhance the performance of CdTe thin film solar cells. For successful implementation, however, it is vital to control the composition and properties of Cd1_xZnxS through device fabrication processes involving the relatively high-temperature CdTe deposition and CdCl2 activation steps. In this study, cross-sectional scanning transmission electron microscopy and depth profiling methods were employed to investigate chemical and structural changes in CdTe/Cd1_xZnxS/CdS superstrate device structures deposited on an ITO/boro-aluminosilicate substrate. Comparison of three devices in different states of completion—fully processed (CdCl2 activated), annealed only (without CdCl2 activation), and a control (without CdCl2 activation or anneal)—revealed cation diffusion phenomena within the window layer, their effects closely coupled to the CdCl2 treatment. As a result, the initial Cd1_xZnxS/CdS bilayer structure was observed to unify into a single Cd1_xZnxS layer with an increased Cd/Zn atomic ratio; these changes defining the properties and performance of the Cd1_xZnxS/CdTe device.
| Item Type: | Article |
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| Additional Information: | Copyright 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The article appeared in Journal of Applied Physics 115, 104505 (2014) and may be found at http://dx.doi.org/10.1063/1.4868224 |
| Keywords: | photovoltaic, solar cells, cadmium telluride |
| Divisions: | Applied Science, Computing and Engineering |
| Depositing User: | Mr Stewart Milne |
| Date Deposited: | 18 Sep 2014 14:52 |
| Last Modified: | 19 Dec 2017 15:13 |
| URI: | https://glyndwr.repository.guildhe.ac.uk/id/eprint/8243 |
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